Patent GB-399833-A (GB)
Title: Improvements relating to magazine roll stands especially applicable to web printing machines
IPC: B65H19/18
Filed: 1932-04-06
Abstract: 399,833. Feeding webs. CRABTREE & SONS, Ltd., R. W., Water Lane, and PHYTHIAN, T. E., 25, Headingley Mount, both in Leeds. April 6, 1932, No. 9826. [Class 100 (i).] In a web-renewing apparatus for printing and other machines in which an expiring web from a reel carried on a stand is automatically brought into contact with a new reel on the stand to be connected thereto and a cutter is operated at the same time to sever the expiring web, the movement of the stand to bring the new reel towards the expiring web is caused automatically and mechanically to operate a pressure member by which the expiring web is applied to the new roll. The roll b in use and reserve rolls b<1>, b<2> are mounted in a threearmed stand a rotatable on the support a<2>. A pressure roller d by which the expiring web from the roll b is pressed against the roll b<1> is carried by arms d<2> fixed to a shaft d<1> having an arm d<9> connected by a link j<3> to a lever j carrying a roller j<1> and connected to a spring rod j<4>. Between each arm of the stand a is an arm i carrying a cam i<1> adapted, as the stand is rotated to bring the roll b<2> towards the expiring web, to engage the roller j<1> and swing the arms d<2> towards the roll b<1>. The lower ends of the arms d<2> are connected to adjustable spring rods d<4> which serve to hold the arms d<2> in the operative and inoperative positions. A knife e<2> is carried by arms e, Figs. 1 and 3, pivoted at e<1> to the arms d<2> and having arms e<3> normally engaged by pins f<1> on spring-controlled members f pivoted to the arms d2 and having arms f<2> engaging the arms e. The members f are also provided with pins f<3> adapted t‹ co-operate with pawls g on bars g<1> adjustably secured to the machine frame. As the arms d<2> moves towards the roll b<1>, the pins f<3> pass beyond the pawls g. After the roller d has united the expiring web to the roll b<2>, the continued rotation of the stand a causes the roll d and arms d<2> to be pushed back towards their inoperative position and the pins f<3> by engagement with the pawls g release the arms e<3> to allow the knife to swing by gravity or spring action into engagement with the expiring web to sever it. The final return movement of the arms d<2> is effected by the spring rods d<4> when the knife is reset by the engagement of the arms e<3> with adjustable stops c<4>, Fig. 1. Before the webs are joined together the new roll b<2> is brought up to the speed of the running web by engagement with endless belts h driven from a shaft h<2>. Each roll is provided with a brake band a<5>, one end of which is anchored to a three-armed plate member a<6>, and the other end to a lever as pivoted to the member a<6> and adapted to be actuated either by a hand-lever a<9> or by an axially movable spindle n<3> operated by worm gearing from chain wheels n<2>. The wheels n<2> engage a chain n<1> which is adapted to be driven by a chain wheel on a shaft carrying a pinion o<4> in mesh with a gear o<3> coaxial with the shaft a<1> of the roll stand. The gear o<3> is driven in one direction or the other by a pinion o<2> and chain gear m<1>, l<2> from a selective mechanism l such as described in Specification 265,256, [Class 100 (i), Feeding and delivering webs &c.], controlled by a tension roller c<2> engaging the web. A handwheel on the spindle of the gear o<2> is provided for manual operation of the brake mechanism when desired. To allow of considerable adjustment of the brake tension when a new roll is brought to running position, the chain m<1> may be driven by a chain m<3> from a chain-wheel adapted to be connected to the shaft h<2> by a clutch q operatively connected by an adjustable link r<1> to a lever r pivoted on the spindle of the lever and extending into the path of rollers i<2> adjustably mounted on the arms i. As the roll moves to running position the roller i<2> actuates the lever r to close the clutch to cause rapid adjustment of the brakes. The rod j<4> connected to the lever may be arranged to actuate a signal lamp to indicate that a webrenewing operation is taking place. Specifications 330,653, [Class 100 (i), Feeding and delivering webs &c.]. and 348,041 also are referred to.